<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Dom extend</title>
  </head>
  <body>
    <script type="text/javascript">
      console.log(Object.getOwnPropertyNames(document.createElement("p").__proto__));
      console.log(Object.getOwnPropertyNames(document.createElement("p").__proto__.__proto__));

    </script>
  </body>
</html>
